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L. H. UNDERWOOD.

TANK FOR HOLDING CORROSIVE SUBSTANCES.

APPucATxoN FILED sEPr.13.419\a.

Patented May 13, 1919.

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TANK FORHOLDING CORROSIVE SUBSTANCES. APPLIcAIIoN FILED SEPT. I3. IQIa.

1,303,421. A Patented May13,1919,

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///////Y CU j I IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII l .J2wrI'IIIIzssEs III/IW y To all whom t may concern UNITED sTATEs PATENToEEioE.

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Specification of Letters `Patent. Patented lay 13, 1919.

Application led September 13,1918. Serial No. 253,996.

Be it known that I, LAWRENCE I-I. UNDER- wooD, a citizen of the UnitedStates, residing at Youngstown, in the county of Mahoning and State ofOhio, have invented a new and useful Improvement in Tanks for HoldingCorrosive Substances, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specication, in which- Figure 1 is a plan view of the tank.

Fig. `2 is a vertical section along the line II-II of Fig. 1. y

Fig. 3 is a vertical section along the line III-III of Fig. 1, and

Fig. 4 is a fragmentary view showing the bottom of the ate frame.

The present invention relates to tanks for holding corrosive substancesand more particularly to an arrangement of a tank lining together with aremovable gate frame, so arranged that the frame can readily bereplaced, without disturbing the lining of the tank and at the same timeform tight joints to prevent leakage. The present invention isillustrated as embodied in a settling tank for the saturated ammoniumsulfate liquor in the lay-product recovery plant for coke ovens.

. The invention, however, is not limited to the type of tank illustratedin the drawings, but may be embodied in other structures.

Referring to the illustrated embodiment of the invention, the settlingtank has a' castiron body 1 and a lead lining 2. The ammonium sulfatecontaining liquor is run into the tank through a pipe 3, and the liquidoverows through a lead overflow pipe l. The bottom of the tank isinclined to permit the easy removal of the crystal ammonium sulfate. Topermit the removal of the tank contents, two gates, indicatedgenerallyat 5 and 6, are provided. Heretofore, considerable difficultyhas been experienced with the acid seeping under the edge of the leadlining at the gates, whenthe same had become worn by the action of thegate and attacking the cast iron body. To overcome this difficulty Ihave provided the following structure.

'Ihe lead lining 2 is continued through the gate holes 10 and is flangedout over the gate frame receiving faces or seats 11 around the gateopenings. The out-turned edge of the lead lining is clamped against thegate receiving seat 11 of the iron body portion by means of the gateframe 12. A number of bolts 13' removably secure the gate frames 12 inplace. The gate frames 12 are of a non-corrodible material, preferablybronze, which will also resist wear to a greater extent than lead or anyof the softer metals or alloys. The gate frame is provided with asliding gate 14C, which is raised by means of the pinion 15 engaging therack 16 on the gate. Beyond the gate frame 12 is a spout 17 ofnon-corrodible material through which the tank contents are discharged.

As shown in the drawings, particularly in Figs. 1 and 3, the turned-overor flanged edge ofthe lead lining 2 extends between the cast iron bodyaround the gate openings and the gate frame.

In the foregoing specification I have referred to a lead linin but Idesire it to be understood that the lining may be formed of any suitablematerial which will not readily be attacked by the corrosive substancefor which the tank is to be used, and the term non-corrodible used inthe claims is intended to cover such lining.

This construction provides means whereby the gate frame can readily beremoved and replaced when worn without disturbing the lining of the tankor spout.

While the preferred embodiment of the present invention has beenspecifically illustrated and described, it is to be understood that theinvention is not limited to its illustrated embodiment, but may beembodied in other structures within the scope of the following claims:

` l. A tank for holding corrosive substances,

having a body of corrodi'ble material and a lining of non-corrodiblematerial and having a gate opening through a wall of the tank, thelining being continued through the gate openin and turned out over theouter surface of t e tank around the gate opening, and a gate frame ofnon-corrodible material seated against the out-turned lining,substantially as described.

2. A tank for holding corrosive substances, having a body of corrodiblematerial and a lining of non-corrodible material and having a gateopening through a wall of the tank, and a gate frame of non-corrodiblematerial secured to the tank body at the gate opening, the tank liningbeing continued between the gate frame and the tank body, substantiallyas described.

3. Atank for holding corrosive substances having a body of corrodiblematerial and a lining of non-corrodible material and having a lgateopening through a vvall of the tank surrounded by a gate frame receivingseat, and having the tank lining continued over said seat, and a' gateframe removablyl secured to and clamping the lining against-the gateframe receiving seat, substantially as described. c

4. A tank for holding corrosive substances having a body of corrodiblematerial and a lining of non-corrodible material and having an openingthrough a Wall of the tank,

the lining being continued through the Sarno opening, and a memberseated against the tank at said opening and clamping the edge of thelining against the tank, substantially as described.

5. A tank for holding corrosive substances having a body of corrodiblemetal and a lining of non-corrodible metal, said tank having a flangedoutlet, the lining being continued throug'h the outlet and alonothe faceof the flange, substantially as described.

In testimony whereof, I have hereunto set my hand.

LAWRENCE H. UNDERWOOD.

Copies oi this patent may be obtained for fLve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

